Formation mechanism of Fe3Al and FeAl intermetallic compounds during mechanical alloying
2005
Enayati, M. H. | Salehi, M.
Fe and Al elemental powder mixtures with composition Fe⁷⁵Al²⁵ and Fe⁵⁰Al⁵⁰ were mechanically alloyed in a planetary ball mill under different conditions. The structural changes of powder particles were studied by x-ray diffractometery and scanning electron microscopy. Mechanical alloying of Fe⁷⁵Al²⁵ and Fe⁵⁰Al⁵⁰ first produced a fine Fe/Al layered microstructure which transformed directly to the corresponding intermetallic compounds, Fe³Al and FeAl, with nanocrystalline structure at longer milling time. No intermediate phase, i.e. solid solution, was formed during mechanical alloying as a precursor to the intermetallic phase. The rate of mechanical alloying process was found to be dependent on milling variables such as rotation speed of mill, ball-to-powder weight ratio and number of milling balls.
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